[FIX] contract: Proper is_recurring_note compute method

Before, the compute method had the same name as the field.

contract/__manifest__.py

@@ -9,7 +9,7 @@
 
 {
     'name': 'Recurring - Contracts Management',
-    'version': '12.0.7.2.2',
+    'version': '12.0.7.2.3',
     'category': 'Contract Management',
     'license': 'AGPL-3',
     'author': "OpenERP SA, "

contract/models/abstract_contract_line.py

@@ -161,7 +161,8 @@ class ContractAbstractContractLine(models.AbstractModel):
         else:
             return 1
 
-    def is_recurring_note(self):
+    @api.depends("display_type", "note_invoicing_mode")
+    def _compute_is_recurring_note(self):
         for record in self:
             record.is_recurring_note = (
                 record.display_type == 'line_note'